Abstract
A 32 meter evacuated drop tube has been used to investigate the solidification of Nb-Ge alloys after deep undercooling. Samples have been supercooled as much as 500°K below the liquidus by using free-fall conditions to eliminate crucible induced nucleation. Final microstructures are dependent on the quenching rates at the bottom of the drop tube with a striking extension of the β phase solubility limit at the higher quenching rates.
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Acknowledgements
The authors thank Alice Worries of the Marshall Space Flight Center for her invaluable assistance with the SEM-EDS work and to Prof. G. J. Abbaschian of the University of Florida for enlightening discussions. N. D. Evans and R.J. Bayuzick are also grateful to NASA for their support under contract number NAS8-34676.
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Lacy, L.L., Robinson, M.B., Rathz, T.J. et al. Solidification Studies of Nb-Ge Alloys at Large Degrees of Supercooling. MRS Online Proceedings Library 9, 87–94 (1981). https://doi.org/10.1557/PROC-9-87
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DOI: https://doi.org/10.1557/PROC-9-87